Rotary engine.



PATENTED NOV. 15, 1904 A. GARVILLE. ROTARY ENGINE.

APPLICATION FILED SEPT. 26, 1904.

N0 MODEL.

ATTORNEYS.-

UNITED STATES Patented November 15, 1904.

PATENT OEEIcE.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No.774,979, dated November 15, 1904. Application filed September 26, 1904:. Serial No. 225,884. (No model.)

To aZ/Z/ whom, it may concern:

Be it known that I, ARTHUR GARVILLE, a citi- Zen of the United States, residingin Paterson, in the county of Passaic and State of New Jersey, have invented certain new and useful improvements in Rotary Engines; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specificaton.

This invention relates to rotary engines; and it consists in a novel arrangement of mechanical elements designed to make the engine available generally for various kinds of work and as such have a standard of efficiency.

The invention consists in certain improvements on a rotary engine disclosed in my United States Letters Patent No. 766,421, which improvementsl have illustrated in the accompanying drawings, wherein Figure 1 is a front view of the engine. Fig. 2 is a vertical sectional view taken in the plane of its main driven shaft. Fig. 3 is a vertical sectional view taken at right angles to said shaft and on the line 00 x in Fig. 2, and Fig. 1 is a vertical sectional view on the line y in Fig. 2.

1 is a cylindrical casing closed at the back by a permanent or integral wall 2and at the front by a removable wall 3 and having a suitable base 4. The center of this casing or cylinder is indicated at 5. \Vithin this casing is arranged concentrically a rotary piston 6. which has a diameter but slightly smaller than the internal diameter of the casing, so that an annular space 7 is left surrounding the piston. This space is divided off into semicircular sections by "diametrically opposed packings 8, set in recesses 9 in the casing and pressed against the periphery of the piston by springs 10. In order to perfectly isolate the space 7 the front and back faces of the piston are provided with packing 11,

which wipes against the adjacent faces of the walls 2 and 3 of the casing.

12 represents eccentric-straps pivoted on studs 13, fixed at opposite points in the outer faces of the walls 2 and 3. These eccentricstraps receive eccentrics 14, fixed in coinciding disposition on a shaft 15, which is the main driven element of the engine and as such is designed to transfer the power through a crank 16, carried thereby. This shaft is rotary and is also designed to move vertically, rectilineally, and transversely of its longitudinal axis, beingjournaled in blocks 17, which move in vertical guideways 18 in the walls 2 and 3 of the casing 1. Upon shaft 15 being so caused to move that while it turns a halfrevolution it passes from one limit of its rectilineal movement to the other the end of crank 16 will be caused to describe an ellipse.

The piston 6 is centered by means of two straps 19, which receive circular trunnions 20, formed integrally with the front and back walls of the casing and concentrically with reference to the axis 5, the ends of said straps 19 being secured to the piston by a pin 21, penetrating them and the piston. The body or web 22 of the piston is formed with an opening whose upper portion is circular. as at 23, and whose lower portion is a slot 24, formed-with opposed guide-ribs 25. Shaft 15 is formed with a U-crank 26, carryinga block 27, which moves in the slot portion 2a of the opening above mentioned and is guided by the guide-ribs 25. The arms of the crank 26 are formed with opposed radial slots 28, in

which slide blocks 29, and these blocks provide journals for opposed pins 30, fixed in a disk 31, which is journaled eccentrically in the piston 6 and has a peripheral rib 32, whereby with the assistance of circular removable plates 33 it is held in its bearing in the piston.

The steam or other fluid for rotating the piston is admitted into a valve-chest 34:, in which is arranged a slide-valve 35 ofwellknown construction. Two ports 36 lead from the circular wall of the casing 1 in opposite directions to points diametrically opposite each other and in a horizontal line, as at 37 in Fig. 1. A third port, 38, leads from between the points where-the ports 36 leave the valve- 1 chest and is the exhaust. The slide-valve in one position admits steam from a pipe 39 to pass through the valve-chest into one of the ports 36, and so on into the interior of the casing 1 to do the work of rotating the piston, while said slide-valve at the same time permitsv the exhaust to pass out through the other port 36 and out to the atmosphere by port 38. In the other limit of its movement these operations are simply reversed. *hen the steam is admitted to the cylinder by either of the ports 36, it acts against the periphery of the piston. Assuming the parts to be in the position shown in Fig. 1, while the center of rotation of the piston is at 5 its center of operation at this time is in shaft 15. The portion of the piston below the shaft rather than that above the shaft tends, therefore, to give way before the steam, with the consequence that since the piston is guided for only rotary movement it rotates in the direction of the arrow shown in Fig. 1. Shaft 5 cannot give way laterally, but only vertically, in the casing and, with reference to the piston, radially thereof. Therefore when the parts reach the t uarter-revolution the block 27 will be at the end of slot 2a which is nearest the periphery of the piston, while the blocks 1?, and consequently the shaft 15, will be half-way down the slots 1S. At the half-revolution the block 27 will have returned to the same position in slot 21 in which it appears in Fig. 2, while the shaft will be inverted, standing at the. lower ends of the slots 18. At the three-quarter revolution the parts will be in relatively the same positions as they were at the q uarter. 1n the position of the parts shown in the drawings, or in the diametrically opposite position, the piston is supported by the straps 19. As it leaves either of these positions the supporting-piston is indirectly thrown onto the shaft 15. and consequently onto the straps 12. For instance, at the quarter or three-quarter positions, where the shaft 1?) stands at right angles to the position in which it is shown in the drawings, the

the interior of the valve-chest down through i t l blocks 29 are supported in the slots 28 by the U- shaped crank 26, and since the pins 30 are journaled in said blocks the piston is supported, through the disk 31, in the block. Peripheral friction is therefore at all times prevented, and such friction as occurs through the play i of the blocks 29 in the slots and the rota l tion of the disk in the piston is practically 11/]. l

Any suitable means (extraneous, if desired) may be employed for operating the slide-valve. I have shown in Fig. 1 for this purpose a lever 10, which may be fulcrumed in the casing and has its lower end projecting between two spaced fingers 41 on a rod 42, carried by one of the straps 12, and its upper end provided with a slot 43, receiving a pin 44: on the stem 45 of the slide-valve 35.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

1. The combination of a cylinder having a circular space therein, a substantially circular piston arranged to rotate in and approximately fitting said cylinder, means for admitting alternately the driving fluid into said cylinder against the periphery of said piston at substantially diametrically opposite points of said piston, means for effecting the exhaust of said fluid, a rotary shaft penetrating the cylinder, a crank on said shaft penetrating the piston, said shaft being movable transversely of its length, means for guiding said shaftrectilineally in said cylinder in the movements thereof transversely of its length, and means for guiding said crank for movement radially in the piston, substantially as described.

2. The combination of a cylinder having a circular space therein, a substantially circular piston arranged to rotate in and approximately fitting said cylinder, means for admitting alternately the driving fluid into said cylinder against the periphery of said piston at substantially diametrically opposite points of said piston, means for effecting the exhaust of said fluid, centrally-disposed trunnions in the cylinder, straps journaled on said trunnions and pivotally connected with said piston eccent'rically of the latter, a rotary shaft penetrating the cylinder, a crank on said shaft penetrating the piston, said shaft being movable transversely of its length, means for guiding said shaft rectilineally in said cylinder in the movements thereof transversely of its length, means for guiding said crank for movement radially in the piston, and means movable in the piston and guided longitudinally in said cranks, said last-named means and the st raps being adapted for centering the piston in the rotation thereof, substantially as described.

3. The combination of a cylinder having a circular space therein, a substantially circular piston arranged to rotate in and approximately fitting said cylinder, means for admitting alternately the driving fluid into said cylinder against the periphery of said piston 1 at substantially diametrically opposite points of said piston, means for effecting the exhaust of said fluid, centrally-disposed trunnions in the cylinder, straps 1ournaled on said truns nions and pivotally connected with said pis ton eccentrically of the latter, a rotary shaft penetrating the cylinder, a crank on said shaft penetrating the piston, said shaft being Inovable, t ansversely of its length, means for gelding said shaft rectllineally in said cylinder in the movementsthereof transversely of its length, means for guiding said erank for movement radially in the piston, a disk journaled in the piston eccentrically thereof, and blocks pivoted on said disk eocentr-ically thereof and guided in said crank for movement therein longitudinally thereof, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this 22d day of I September, 1904.

ARTHUR CARVILLE.

Witnesses:

JOHN W. STEWARD, WM. D. BELL. 

